• Proceedings of the KIEE Conference
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• 2004.07c
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• pp.1664-1666
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• 2004

This paper describes the use of Armaid papers and varnishes in electric motors. We compare with boundary element method(BEM) and finite element method(FEM) by calculated electric field strength. Several computer software package to perform such calculations based on electrostatic field and applicable DC are available.

• Journal of the Korean Graphic Arts Communication Society
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• v.25 no.1
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• pp.95-107
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• 2007

This study starts to find a way out, experiment and apply commercial UV coatings to the cap closures. The cap closures is made form coating and succeeding deformation process. It is coated with several printing layers, printing and over print varnish coating. Then it pressed in three steps of press called 'deep-drawing'. In this study, two kinds of coating was designed and accomplished in the base of the same manufacturing and environment conditions. Consequently, UV curable ink have adequate performance in this experiment (T-bending, Erichsen Test), but it were experienced several damages in this experiments (web-bending, impact test). They were not cured enough to endure the friction and a unique shape of serial cracks were appeared.

• Proceedings of the KIEE Conference
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• 2006.05a
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• pp.71-73
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• 2006

Our company(KOWACO) has periodically performed off-line diagnostic test for 14 hydro generators (rated 11 kV over) for 15 years. In this paper, we summarized results of dissipation factor tip-up test and partial discharge test about these generators. Among these, we chose two generators and performed insulation reinforcement (cleaning and varnish Painting). We compared change of insulation condition for the stator winding based upon off-line diagnostic test result before and after repair. Test result shows that insulation condition was improved after insulation reinforcement. This insulation reinforcement has a function to reduce cause of deterioration, so we can know that it extends lifetime of generator and it is a very important factor for stable operation of facilities.

• KSTLE International Journal
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• v.3 no.1
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• pp.26-29
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• 2002

The International Lubricant Standardization and Approval Committee (ILSAC) GF-3 passenger car engine oil specification has been introduced commercially in July 2001. The new specification oil provides superior performance in terms of fuel economy, control of high temperature deposits, and oil consumption. These enhanced performances of GF-3 engine oil need high quality base oil as well as a better additive system. In this paper, the effect of base oil on various performances of ILSAC GF-3 engine oil was investigated. From the GF-3 sequence engine tests, Group III base oil shows better performance in fuel economy retention, oxidation and varnish control than combination of group III and group II or group III and group 1.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2011.10a
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• pp.185-191
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• 2011

• Journal of the Korean Graphic Arts Communication Society
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• v.29 no.3
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• pp.1-16
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• 2011

In these days, according to increased environmental regulations, to reduce the VOC content in paints and inks efforts are now in progress. A lot of research have progressed hydrocarbon solvents substitute with vegetable oil or ester in the printing ink but it is restricted to use vegetable oil in the inks because of high molecular weight and viscosity. Oil ester currently developed for printing inks still have some drawbacks, but overall the printability and print quality when using ester than hydrocarbon solvents are showing good results. Thus, in this paper, I studied about the properties variation of the varnish and inks according to vegetable ester, after I reacted vegetable ester using the vegetable fatty acid and ethyl alcohol, butyl alcohol. The compared in order of average molecular weight by the GPC method, rheological properties were found by rotational rheometer, and emulsion behavior were compared by high speed emulsification tester.

• Journal of the Korean Graphic Arts Communication Society
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• v.29 no.3
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• pp.133-142
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• 2011

We produce a photosensitive convex plate to research a Nickel metal relief printing plate using galvanic process. A Method for preparing DLC convex plate that is metalized on Nickel metal relief printing plate using CVD(Chemical Vapor Deposition) process and $N_2DLC$-convex plate that is DLC metalized thin film layer of $N_2$ plasma surface treatment are comprised. DLC thin film layers on Nickel surface are fragile. The results of the research indicate that the coefficient of friction on DLC metalized thin film layer is relatively low than Nickel surface and the durability of Nickel surface coated DLC metalized thin film layer is superior to Nickel surface. A relative evaluation of three form plate wetting properties using varnish liquid-drop plate indicates superior printing aptitudes for $N_2DLC$, DLC, Nichel plate order as above.

• The Journal of the Korean dental association
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• v.48 no.6
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• pp.443-453
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• 2010

We examined progress in oral health of Korean 5 year olds children and dental public health infrastructure since the National Health Promotion Plan 2010 Oral Health Objectives were issued. We summarize trends in the prevalence of dental caries and trends in national public oral health program activities and budget. The Oral Health Objectives were achieved in 2006. Oral health in Korean preschool children improved considerably by improving of lifestyle and consumption of fluoride containing toothpaste. Although the number of public oral health center and the budget of oral health education were increased, the impact of public oral health program for preschool children was not influential. New oral health program for infants such as fluoride varnish application and strengthening of existing public oral health program should be performed for continuing improvement of oral health in Korea.

• 프린팅코리아
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• v.9 no.12
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• pp.108-111
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• 2010

한국인쇄학회(회장 구철회) 정기총회 및 추계학술논문발표회가 지난 11월 19일 오후 1시부터 서울인쇄정보센터 7층 강당에서 열렸다. 논문발표회에는 백용국 조선일보 차장의 'Gray balance를 활용한 신문인쇄 품질 향상을 위한 연구', 박정민 광명잉크 수석연구원의 'Vegetable Oil Ester에 따른 Offset 잉크의 물성 변화에 관한 연구', 이원규 부경대학교 대학원생의 '국내 오프셋 인쇄물 평가를 위한 최적의 Proofing 조건에 관한 연구', 오승재 부경대학교 대학원생의 '일반 교정인쇄물과 국내 오프셋 인쇄물의 비교 평가에 관한 연구', 송스엽 광명잉크 대리의 '로진변성페놀수지의 Cooking 온도에 따른 Varnish Rheology 물성 변화에 관한 연구', 허경영 (주)젠켐 대리의 '무극성 플라스틱 소재용 잉크 개발 및 소재의 부차성에 관한 연구', 권희경 부경대학교 대학원생의 '폐잉크를 이용한 스크린 인쇄용 블랙 잉크 제조에 관한 연구', 문성환 국군인쇄창 7급의 '국내인쇄환경에서 친환경잉크를 이용한 오프셋 인쇄의 색재현에 관한 연구' 등의 발표됐다. 본지에서는 '국내 오프셋 인쇄물 평가를 위한 최적의 Proofing 조건에 관한 연구'를 소개한다.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.29 no.12
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• pp.829-834
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• 2016

Coil specimens were prepared by continuous coating on a copper wire with flexible PAI (polyamideimide) and PAI/nanosilica (5 wt%) varnish and thermally aged at 150, 200 and $250^{\circ}C$ for 5, 10 and 15 days, respectively. AC insulation breakdown voltage was investigated under inverter surge condition at 60 Hz and 1,000 Hz and insulation breakdown voltage decreased with increasing aging temperature and aging time at each 60 and 1,000 Hz.